Abstract: This research is an improvement research instrument of Elementary Science Learning that was oriented on the approach of guided discovery. It was implemented into the learning activity. The background of this research was the reality of learning activity in the classroom, which tends to be focused on the teacher and the purpose of the product. This learning activity was not match with the curriculum demands and the Science Learning purposes. The purpose of this research is to investigate the teachers’ ability in managing the learning activity of guided discovery, to identify both teacher and students’ activity in the learning activity and to know the students’ result of IPA learning activity. This research is a classroom action research by following the procedure of classroom action research. The subject of this research were elementary students on level five, Elementary School No. 59 South of Gorontalo City, year 2002/2003. Based on the data analysis and the conclusion of the research result, it was concluded: (1) the teachers’ ability in managing the learning activity of guided discovery was categorized well; (2) the result of data analysis on monitoring teachers and students activity on the learning activity was centered on the students; (3) the result of analysis Learning Result Test showed that the learning activity of guided discovery was effective to achieve the completed of learning purposes both the product and the process. By using the indicator: teachers’ ability in managing the learning activity, teacher and students’ movement in learning activity and the students’ learning result as a learning quality parameter. In addition, based on the data and the result of research data analysis, it can be concluded that the learning activity had been oriented on the approach of guided discovery can improve the quality of Elementary Science Learning.